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    CREATE TABLE d (a int, b int, c int) DISTRIBUTED BY (a);
    CREATE TABLE r (a int, b int, c char(255)) DISTRIBUTED REPLICATED;
    --INSERT INTO d SELECT 1, generate_series(1,10), 1;
    --INSERT INTO r SELECT 1, 2, generate_series(1,100);
    SET optimizer_enable_groupagg = off;
    EXPLAIN (ANALYZE off, COSTS off, VERBOSE off)
    WITH e AS (
        SELECT DISTINCT b FROM d
    ), h AS (
        SELECT a FROM d JOIN e f USING (b) JOIN e USING (b)
    ) SELECT * FROM r JOIN h USING (a) JOIN h i USING (a);
                                           QUERY PLAN
    ----------------------------------------------------------------------------------------
     Gather Motion 3:1  (slice5; segments: 3)
       ->  Sequence
             ->  Shared Scan (share slice:id 5:0)
                   ->  Materialize
                         ->  HashAggregate
                               Group Key: d_1.b
                               ->  Redistribute Motion 3:3  (slice4; segments: 3)
                                     Hash Key: d_1.b
                                     ->  Seq Scan on d d_1
             ->  Sequence
                   ->  Shared Scan (share slice:id 5:1)
                         ->  Materialize
                               ->  Hash Join
                                     Hash Cond: (d.b = share0_ref2.b)
                                     ->  Hash Join
                                           Hash Cond: (d.b = share0_ref3.b)
                                           ->  Redistribute Motion 3:3  (slice3; segments: 3)
                                                 Hash Key: d.b
                                                 ->  Seq Scan on d
                                           ->  Hash
                                                 ->  Shared Scan (share slice:id 5:0)
                                     ->  Hash
                                           ->  Shared Scan (share slice:id 5:0)
                   ->  Hash Join
                         Hash Cond: ((r.a = share1_ref3.a) AND (r.a = share1_ref2.a))
                         ->  Result
                               ->  Seq Scan on r
                         ->  Hash
                               ->  Redistribute Motion 3:3  (slice2; segments: 3)
                                     Hash Key: share1_ref3.a, share1_ref2.a
                                     ->  Hash Join
                                           Hash Cond: (share1_ref3.a = share1_ref2.a)
                                           ->  Shared Scan (share slice:id 2:1)
                                           ->  Hash
                                                 ->  Broadcast Motion 3:3  (slice1; segments: 3)
                                                       ->  Shared Scan (share slice:id 1:1)
     Optimizer: Pivotal Optimizer (GPORCA)
    (37 rows)
  ]]>
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